[MacPorts] #71881: avahi: add python 3.13 variant

[MacPorts]

#71881: avahi: add python 3.13 variant
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 Reporter:  mascguy  |      Owner:  i0ntempest
     Type:  defect   |     Status:  assigned
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:  2.10.5
 Keywords:           |       Port:  avahi
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 Hopefully upstream already supports Python 3.13

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Ticket URL: <https://trac.macports.org/ticket/71881>
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